User Manual Rocket Port Converter C52/C53 2000137 Rev B 1
Overview The Comtrol Rocket Port Converters are smart RS-232 to RS-422/485 bi-directional converters. They allow you to convert one RS-232 port to and from either RS-422 or RS-485 ports. You use the converter to control devices with a longer than normal distance between the host and the device, and to communicate with several devices. Operations like point-to-point and multi-drop are available to meet your needs.
Specifications C52/C53 Specification Current consumption: C52 - DC +9V to +30V, 150mA max. C53 - DC +9V to +30V, 270mA max. Baud rate: Up to 921.6K bps under 500 feet (0.15Km) Distance Up to 4000 feet (1.2 Km) under 115200 bps Note: Baud rate is dependent upon hardware and operating system configuration.
Package Check List C52 (C53) RS-232 to RS-422/RS-485 bidirectional converter Power adapter Cable Mounting kit User manual Installation 1. The RS-232 and RS-422-485 ports are labeled clearly on the surface of the C52 and C53 converters. Prepare the RS-232 cable and decide the operation mode as well as the 2/4-wire cable in advance. See the RS-232 Cable Wiring and Operations sections. If you need to change the operation mode, remove the two screws on top of the converter and open the cover.
RS-422/RS-485 Pinouts The RS-422/RS485 interface with the RJ45 Jack connector or Terminal Block Connector is shown as follows: R J - 4 5 C o n n e c to r T e r m in a l B lo c k C o n n e c t o r 1 1 2 3 4 5 6 7 8 9 10 2 3 4 5 6 7 C52/C53 RS-422 RJ45 Jack Connector Pinouts Terminal Block Signals Connector Pinouts Signals 1 TxD-(A) 1 TxD+(B) 2 RTS-(A) 2 TxD-(A) 3 RTS+(A) 3 RxD+(B) 4 Signal GND 4 RxD-(A) 5 TxD+(B) 5 Signal GND 6 RxD+(B) 6 Power GND 7 Signal GND 7 VCC
Operation The C52/C53 supports four kinds of operations. They are: • Point-to-point, 4-wire full duplex • Point-to-point, 2-wire half duplex • Multidrop, 4-wire full duplex • Multidrop, 2-wire half duplex Note: If possible, connect the GND of both sides together to gain better signals. For example, you may need one more GND connection in addition to the 4-wire or 2-wire connections.
Reference Section RS-232 Pinouts The following depicts the RS-232 interface with the RJ45 connector. C52/C53 RJ45 Connector Pinouts RS-232 Signals 1 DCD Always On 2 DTR 3 CTS 4 GND 5 RxD 6 TxD 7 GND 8 RTS 9 DSR 10 ------ Note: The DTR and DSR pins have been shorted. This releases the users from the hardware flow control wiring problems. Therefore, only two types of RS-232 cable wiring examples are listed in the following.
RS-232 Cable Wiring Type 1: To connect the RS-232 side of a C52 or C53 to a DTE (Data Terminal Equipment or “your PC”) or DCE (Data Communications Equipment or “remote device”). Check the precise DTE/DCE pinouts. For an example, see the following DTE/DCE pinout examples.
Type 2: To connect the RS-232 side of a C52 or C53 to a DTE (Data Terminal Equipment or “your PC”) with a 3-pin wiring if you don’t require hardware flow control.
Impedance Matching and Termination Resistors When an electrical signal travels through two different resistance junctions in a transmission line, the mismatch will sometimes cause signal reflection. Signal reflection causes signal distortion, which in turn will contribute to communication errors. The solution to this problem is to establish the same impedance at the RS-485 line ends as in the line itself by terminating them with resistors.
Contacting Technical Support Comtrol has a staff of support technicians available to help you.
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